What if there is no subscript for a element?

How much heat is absorbed by a 31g iron skillet when it's tempature rises from 8c to 81c

Which of the following is a force acting at a distance?

what is the acceleration of a cabinet of a mass 45 kg if it is pushed by applying horizontal force of 25 Newtons and 18 Newtons

4. The amount of distance you need to stop the car increases with specu. A. true B. false

An energy-efficient water heater draws 4 amps in a 220-volt circuit. It costs $75 more that a standard water heater that draws 18 amps in a standard 115-volt circuit.

Which type of wave experiences a change in speed when entering a new medium? a) only sound waves b) both sound and light waves c) only light waves d) neither sound or light waves

Three basic classes of collisions include all but which of the following?

How does the use of biomass energy to create electricity harm the environment

Which physical property of iron made it popular for use in weapons? 1. Magnetism 2. Luster 3. Malleability 4. Ductility

a 2 kg rock is dropped from the top of a 30 m High building calculate the ball at the time that it strikes the ground